Hydrothermal synthesis method of Fe-MFI molecular sieve

Abstract

The invention discloses a hydrothermal synthesis method of a Fe-MFI molecular sieve. The method comprises the steps of (1) fully mixing an iron source, a silicon source, a template agent and deionizedwater, performing hydrolyzing, and keeping the temperature at 60-90 DEG C to obtain molecular sieve precursor gel; (2) preparing a crystallizing auxiliary agent, wherein the crystallizing auxiliary agent is CeO2-RuO2 composite oxide powder; (3) mixing the molecular sieve precursor gel with the crystallizing auxiliary agent, placing the mixture in a sealed vessel for heating to 160-180 DEG C, preserving the heat for 3 days or above, and then performing filtering, washing, drying and roasting to obtain the Fe-MFI molecular sieve. The hydrothermal synthesis method of the iron-containing MFI molecular sieve is improved, the catalytic conversion rate of the prepared iron-containing MFI molecular sieve on alpha-phenylethanol is obviously increased, and the catalytic stability of the synthesizedFe-MFI molecular sieve is superior to that of a Fe-MFI molecular sieve synthesized by means of a common synthesis method.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and in particular relates to a hydrothermal synthesis method of Fe-MFI molecular sieves. Background technique [0002] Molecular sieve is a kind of material with precise pore size and small pores. Generally, silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron are the basic structural units, and a type of silicon-alumina with cage or pore structure is composed of oxygen bridges formed by oxygen atoms. salt crystals. With characteristics such as larger specific surface area and shorter diffusion path, it is a good catalyst and adsorption material. [0003] Using other elements, such as some main group elements or transition metal elements with variable valence characteristics, to isomorphically replace part of the silicon, aluminum or phosphorus in the molecular sieve framework to form a heteroatom-containing molecular sieve framework is called heteroatom molecular sieve. Due to...

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on the catalytic performance of Fe-MFI molecular sieves to catalyze the dehydration of α-phenylethanol to styrene. High, it is difficult to meet the actual use requirements

Images